A Reversible Reaction Is Said to Have Reached Equilibrium When

A reversible reaction is said to have reached equilibrium when which of the following conditions is established?

A) The reverse reaction begins to occur.
B) The rates of the forward and reverse reactions become equal.
C) The rate of the forward reaction diminishes to zero.
D) The concentrations of reactants and products become equal.
E) The reactants are completely consumed.